From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Vehicle suspension testing, concerning low-speed valves, shock absorbers, and axle movements.
| Identifier | ExFiles\Box 52\1\ Scan012 | |
| Date | 18th June 1928 guessed | |
| contd :- -3- Also, at the present moment if some foreign matter lodges under the low speed valve, the low speed loading ceases to exist which is undesirable if the car is relying on the dampers to prevent high speed wobbles. It has occurred in our tests. A velocity pressure increase would always ensure some low pressure for quick movements; to clean the low pressure valve seat is not easy. We hope to measure the pressures set up at the ball end by a hydraulic device in the connecting tube, and so determine the mechanical efficiency of the shock absorbers. We are also endeavouring to get a picture of the front and rear axle movements against a time basis, so that we can once and for all establish the relation between the axle velocity for Boulevard high frequency small amplitude movements, and humped back bridge low frequency large amplitude oscillations. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||